Belt-shifting mechanism



R. W. KREMIER ET AL BELT SHIFTING MECHANISM Original Filed July 24, 1.920 2 Sheets-Shget 1 "57 v I/ 4 lg j? 45 v 1 ll L i W Z 4/ y k 3 q "Q 4 6 Ha (i f w r gwvcufo'oL J FOAM Kramer m 1 m): neg L Nov, 25, 1924, I 1,517,078

R. W. KREMER ET AL BELT SHIF'IING MECHANISM Original Filed July 24. 1920 2 Sheets-Sheet? 22554 5 I zo zygr/ 176/776/ 4/70/ gwueniom.

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Patented Nov. 25, 1924.

ROBERT W. KBIEMEB, AND ROBERT R. CUMMINS, OF CLEVELAND, OHIO, ASSIGNORS TO THE KREMER-CUMMII TS MACHINE COMPANY, OF CLEVELAND, OHIO, A CORPORA- TIO'N OF OHIO.

BELT-SHIFTI NG MECHANISM.

Application filed Jully 24s, 1920, Serial No. 398,762. Renewed April 15, 1924- .7'0 (177 whom it may concern Be it known that we, Ronnntr TV. KnnMnn and l lonnnr It. CUMMiNs, both citizens of the United States, and residents of Cleveland, county of Uuyahoga, and State of Ohio, have jointly invented a new and useful Improvement in Belt-Shifting Mechanism, of which the following is a specificalion; the principle of the invention being herein explained, and the best mode in which I have contemplated app-lying that principle so as to distinguish it from other inventions.

The present invention, relating, as indicated, to belt shifting mechanism, is more particularly directed to a mechanism for shifting the belt on a drill press or similar machine tool. There are of course a number of different mechanisms in more or less general use for shifting belts on lathes and tools of that character, but there are but few mechanisms which may beused on drill presses to advantage,and one of the chief objects of this invention is the provision of a simple and inexpensive mecha nism which. may be used for the purpose stated on a drill press. To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claim.

The annexed drawing and the following description set forth in detail certain mechanism embodying the invention, such disclosed means constituting, however, but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawings:

l ig. 1 is a view in perspective of a drill press, together with an improved belt-shifting mechanism; Fig. 2 is a side elevation of the machine; F 3 is a front elevation of the same; and Fig. 1 is an end elevation of one of the belt-shifting members.

In Fig. 1 there is shown an ordinary type of drill press consisting of a base 1 and a pedestal 2, the usual. work support 3 and drill spindle i. The latter is driven from a horizontal shaft 5 disposed atthe top of the frame or pedestal and carrying a series of pulleys 6, 7, S and 9, which form the usual step pulley. At the base of the machine there is mounted a second shaft 10 parallel with the first-named shaft 5, and

carryinga series of reversely arranged pulleys 6, 7, S and 9. A belt 11 is engaged over the pulleys and operates in the usual manner. The shaft 10 is driven through a pulley 12 carried on one end, which may be operated by a belt from any suitable source of power. Our improved belt shifting mechanism consists of two supporting plates Or feet 1.3 and 14:, which may be mounted one on either side of the shaft 10. These feet may be suitably atached to the floor, to the bench if the drill press is of the bench type, or, in some cases, to the machine itself, and are each provided with sockets 15, in which are supported rods 16. These rods 16 support a transverse member 18 which is hollow, and is preferably in the form of a pipe for cheapness and strength. This pipe is attached at either end to couplings 19 and 20. The coupling 20 is of the loop type, and intoits vertical portion is engaged a vertically arranged pipe support 21 which extends upward to a point adjacent to the upper pulley of the shaft 5.

The mechanism for shifting the belt along the steps of the upper pulley consists of a bell crank lever having two arms 22 and 23 connected by a shaft 24, which is oscillatorily mounted in a coupling 25, carried on the upper end of the support 21. The arm 22 of this bell crank lever is provided with a slidably mounted rod 26, which carries a belt encircling loop 27. The same construction is provided in the cou pling 19, there being a bell crank lever having two arms 28 and 29 connected by means of a shaft 30, which extends through the pipe 18. The arm 28 is provided with a slidably mounted rod 32 carrying a belt encircling loop 33. The shaft is maintained in the position indicated by means of a spring 34.- carried in the coupling 19 and pressing against the collar, 85, which is pinned to the shaft. The spring acts against one end of the coupling and then against the collar to press the lower end of the lever 28 snugly against the outer face of the coupling 19.

The operation of the belt shifting loops is effected by means of a vertical rod 37, which is attached to the outer ends of the two bell crank arms 23 and 29. The attachment of this rod to .dle 45;;is pressed" downward.

the arms 23 and 29 is positive for movement in one direction by means of the nuts or washers 38 and 39 carried on the ends of the rod 37 and engaged againstthe outer ends of the two arms 23 and 29. Also carried on the rod 37 are nuts or washers 40 and 41, between which and the arms 23 and 29 are mounted springs 42 and 43. An operating handle 45 is pivoted at a convenient point on the support 2land is engaged with the 'rodf37.

The operation of the device is .as follows :If itis desired to shift the belt along the upper pulley to a larger step the ban- 7 This movement of the handle lifts the rod 37 and immediately. rocks the arms 28 and 29 of the bell crank in a counter-clockwise direction, "as viewed inFig. 1, which causes the belt engaging loop 33 to press the belt onto the nextsmaller step of the lower pulley. At

the same time the vertical movement of the left, so that as soon as the belt is slipped onto; the next smaller step of the lower pulley, this pressure against the upper bell crank arms causes the belt engaging loop 27 to press the belt over the next larger step on the upper pulley. V

Similarly, if the belt is to be engaged over a larger step on the lower pulley, the handle 45 is pushed upwardly, thus depressing the rod 37. .This movement of the rod 3? at once pulls the belt-engaging loop 27 to the right and slips the belt onto the next smaller step of the upper pulley, and at the sametime loads the spring 43 so that it is caused to force the bolt onto the next larger step of the lower pulley.

The present belt-shifting mechanism is extremely simple, both in its construction and in its operation, since it can be operated by one hand and through a single lever.

The action of the connections between the upper and lower belt engaging loops is such as to effect a delayed movement of the beltshifting loop which is to force the belt onregards the mechanism herein disclosed,

provided the means stated by the following claim or the equivalent of such stated means be employed.

e therefore particularly point out and distinctly claim as our invention In beltshifting mechanism, the combination with two reversely arranged step pulleys and a belt engaging thereover; of belt shifting mechanism including a frame, two arms pivotally associated, with said frame, belt engaging loops carried by said arms, a single operating lover, a vertical rod shiftable by means of said lever: and lost motion connections between said rod and said two arms, said connections being adapted to effect immediate operation of one of said arms and delay operation of the other of said arms.

Signed by us this 21 day of May, 1920.

ROBERT lV. KREMER. ROBERT R. GUMMINS. 

